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  1. Holmes

    Chemistry: Post your doubts here!

    A good one. 27- 30 INSHALLAH how was yours?
  2. Holmes

    Chemistry: Post your doubts here!

    NO issue. Just stay confident that you know everything in the syllabus
  3. Holmes

    Chemistry: Post your doubts here!

    INSHALLAH
  4. Holmes

    Chemistry: Post your doubts here!

    Ok I didn't know.
  5. Holmes

    Chemistry: Post your doubts here!

    Q17 ?? CaCO3 + 2HCl ------> CaCl2 + CO2 + H2O moles of HCl = (36*0.500)/1000 = 0.018 moles Moles of CaCO3 = 0.009 moles Mr of CaCO3 = 100 Mass of CaCO3 =100*0.009 = 0.9 g % of CaCO3 in 2.00 g mass: = (0.9/2) * 100 = 45% Hope I helped :)
  6. Holmes

    Chemistry: Post your doubts here!

  7. Holmes

    Chemistry: Post your doubts here!

    Tipssss! Stay Calm and relaxed. My teacher advise me to solve the organic part of the paper before because that gives us confidence about the paper. If you are good at Organic then you can do the same. :)
  8. Holmes

    Chemistry: Post your doubts here!

    Q4 I dont understand what Np Pu mean?? If you look at the periodic table: at the actinoids period you will find both Np = NEPTUNIUM Pu = PLUTONIUM HOPE I HELPLED! :)
  9. Holmes

    Chemistry: Post your doubts here!

    Q24 How can D be correct? Doesnt hot kmno4 oxidise to aldehydes and cooh? It purely depends on the position of C=C and the number of groups attached to it. A compound like this CH3CH2CH2OH will be oxidised to form : CH3CH2COOH (forming Carboxylic Acid) While a compound like this ...
  10. Holmes

    Chemistry: Post your doubts here!

  11. Holmes

    Chemistry: Post your doubts here!

  12. Holmes

    Chemistry: Post your doubts here!

    Q24 How can D be correct? Doesnt hot kmno4 oxidise to aldehydes and cooh? It purely depends on the position of C=C and the number of groups attached to it. A compound like this CH3CH2CH2OH will be oxidised to form : CH3CH2COOH (forming Carboxylic Acid) While a compound like this ...
  13. Holmes

    Chemistry: Post your doubts here!

  14. Holmes

    Chemistry: Post your doubts here!

  15. Holmes

    Chemistry: Post your doubts here!

    Oh a bit tricky but an easy one: the correct answer is A. If you look at the oxidation state of Br2 . Before the reaction it is 0 but t after the reaction is oxidation state decreases to -1. Br2 = 0 CH3CHBrCH2Br : here oxidation state of Br is -1. I hope it make sense. :p
  16. Holmes

    Chemistry: Post your doubts here!

    http://papers.gceguide.com/A Levels/Chemistry (9701)/9701_s16_qp_13.pdf Respected amina1300 , the link you have posted is of variant 13 while when you click on the link variant "12" opens. Kindly look to the problem.
  17. Holmes

    Chemistry: Post your doubts here!

    Q 30. X has a Ph=3 so this shows that this is an acid. so it would be : CH3CH2CH2COOH Compound Y is a secondary alcohol which would be like: CH3CH(OH)CH3 When X and Y are heated together with Concentrated H2SO4 an ESTER and water is obtained. following steps are occur. H from acid and OH from...
  18. Holmes

    Chemistry: Post your doubts here!

    I am speechless. You are great. Thanks for TEACHING me this question. Thanks again and again. (y)
  19. Holmes

    Chemistry: Post your doubts here!

    What paper is this?? Variant???
  20. Holmes

    Physics: Post your doubts here!

    that's what I did. Can you plz show some working?
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